Refrigerator makes a gurgling or hissing sound periodically.

Note: Gurgling and hissing sounds are often normal in modern Etna refrigerators.

Steps:

• Identify pattern: If the sounds occur mainly when the compressor starts or stops, they are likely normal refrigerant flow noises.
• Check for leaks: Inspect the rear of the unit for oil stains or strong chemical odors, which could indicate a refrigerant leak. If present, unplug the unit and call a technician.
• Ensure stability: Make sure the refrigerator is level and not touching walls or cabinets that can amplify normal sounds.